EP3778767B1 - Composition de résine thermoplastique et article moulé en résine thermoplastique - Google Patents

Composition de résine thermoplastique et article moulé en résine thermoplastique Download PDF

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EP3778767B1
EP3778767B1 EP20759477.1A EP20759477A EP3778767B1 EP 3778767 B1 EP3778767 B1 EP 3778767B1 EP 20759477 A EP20759477 A EP 20759477A EP 3778767 B1 EP3778767 B1 EP 3778767B1
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copolymer
thermoplastic resin
resin composition
based monomer
weight
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German (de)
English (en)
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EP3778767A4 (fr
EP3778767A1 (fr
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Joon Hwi Jo
Seong Lyong Kim
Tae Hoon Kim
Dae Woo Lee
Jae Bum Seo
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LG Chem Ltd
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LG Chem Ltd
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Priority claimed from PCT/KR2020/001835 external-priority patent/WO2020171453A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
    • C08F212/02—Monomers containing only one unsaturated aliphatic radical
    • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
    • C08F212/06—Hydrocarbons
    • C08F212/12—Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/12—Copolymers of styrene with unsaturated nitriles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/14—Copolymers of styrene with unsaturated esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/16—Homopolymers or copolymers of alkyl-substituted styrenes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C08L33/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/30—Applications used for thermoforming
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • the present invention relates to a thermoplastic resin composition and a thermoplastic resin molded article, and specifically, to a thermoplastic resin composition and a thermoplastic resin molded article which are excellent in heat resistance, impact resistance, colorability, and scratch resistance.
  • a diene-based thermoplastic resin composition which includes a diene-based graft copolymer formed by graft copolymerization of a diene-based rubber polymer with an aromatic vinyl-based monomer and a vinyl cyanide-based monomer, has been used in various fields such as electricity, electronics, construction, automobiles, and the like due to having excellence in impact resistance, stiffness, chemical resistance, and processability.
  • the diene-based thermoplastic resin composition is not suitable as an outdoor material due to having poor weather resistance.
  • an acrylic thermoplastic resin composition which is excellent in weather resistance and aging resistance and includes an acrylic graft copolymer formed by graft copolymerization of an acrylic rubber polymer with an aromatic vinyl-based monomer and a vinyl cyanide-based monomer, has attracted attention as an alternative.
  • a method of applying poly(methyl methacrylate) to the acrylic thermoplastic resin composition has been proposed to improve colorability and scratch resistance, but there is a problem of degradation of impact resistance.
  • a method of applying a styrene/acrylonitrile/methyl methacrylate copolymer to the acrylic thermoplastic resin composition has been proposed, but there is a problem of degradation of impact resistance and heat resistance.
  • KR 20130057795 A discloses a thermoplastic resin composition comprising: a graft acrylic copolymer; an aromatic vinyl-vinylcyanide-based copolymer; and a polymethylmethacrylate resin, and discloses a methylmethacrylate-styreneacrylonitrile copolymer as the aromatic vinyl-vinylcyanide-based copolymer.
  • the present invention is directed to providing a thermoplastic resin composition and a thermoplastic resin molded article which are excellent in weather resistance, heat resistance, impact resistance, colorability, and scratch resistance.
  • thermoplastic resin composition which includes: a first copolymer including an acrylic graft copolymer; a second copolymer including an alkyl-substituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit; a third copolymer including an alkyl-unsubstituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit; and an additive including a silicone compound .
  • thermoplastic resin molded article formed of the above-described thermoplastic resin composition and having a heat deflection temperature of 90 °C or more, an L value of 25.5 or less, and a pencil hardness of F or more.
  • thermoplastic resin composition and a thermoplastic resin molded article according to the present invention can exhibit significantly improved weather resistance, heat resistance, impact resistance, colorability, and scratch resistance.
  • the average particle diameter of an acrylic rubber polymer may be measured by a dynamic light scattering method, specifically, by using a Nicomp 380 HPL instrument (manufactured by PSS Nicomp).
  • an average particle diameter may refer to an arithmetic average particle diameter in the particle size distribution as measured by a dynamic light scattering method, that is, an average particle diameter measured in the scattering intensity distribution.
  • a weight-average molecular weight may be measured as a relative value with respect to a standard polystyrene (PS) sample by gel permeation chromatography using tetrahydrofuran as an eluate.
  • PS polystyrene
  • an alkyl-substituted styrene-based monomer unit may be a unit derived from an alkyl-substituted styrene-based monomer.
  • the alkyl-substituted styrene-based monomer may be one or more selected from the group consisting of ⁇ -methyl styrene, p-methyl styrene, and 2,4-dimethyl styrene, with ⁇ -methyl styrene being preferred.
  • an alkyl-unsubstituted styrene-based monomer unit may be a unit derived from an alkyl-unsubstituted styrene-based monomer.
  • the alkyl-unsubstituted styrene-based monomer may be one or more selected from the group consisting of styrene, p-bromostyrene, o-bromostyrene, and p-chlorostyrene, with styrene being preferred.
  • a vinyl cyanide-based monomer unit may be a unit derived from a vinyl cyanide-based monomer.
  • the vinyl cyanide-based monomer may be one or more selected from the group consisting of acrylonitrile, methacrylonitrile, ethacrylonitrile, and 2-chloroacrylonitrile, with acrylonitrile being preferred.
  • a (meth)acrylate-based monomer unit may be one or more selected from the group consisting of units derived from an acrylate-based monomer and a methacrylate-based monomer.
  • the (meth)acrylate-based monomer may be one or more selected from the group consisting of a C 1 to C 10 alkyl acrylate-based monomer unit and a C 1 to C 10 alkyl methacrylate-based monomer unit.
  • the (meth)acrylate-based monomer may be one or more selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, and decyl (meth)acrylate, with one or more selected from the group consisting of methyl methacrylate and butyl acrylate being preferred.
  • a vinyl-based monomer may refer to one or more selected from the group consisting of an aromatic vinyl-based monomer and a vinyl cyanide-based monomer.
  • the aromatic vinyl-based monomer may refer to one or more selected from the group consisting of an alkyl-substituted styrene-based monomer and an alkyl-unsubstituted styrene-based monomer.
  • thermoplastic resin composition includes: 1) a first copolymer including an acrylic graft copolymer; 2) a second copolymer including an alkyl-substituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit; and 3) a third copolymer including an alkyl-unsubstituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, a (meth)acrylate-based monomer unit; and an additive including a silicone compound .
  • thermoplastic resin composition according to an embodiment of the present invention may further include 4) a (meth)acrylate-based polymer.
  • thermoplastic resin composition according to an embodiment of the present invention will be described in detail.
  • the first copolymer may impart excellent weather resistance, impact resistance, elongation, colorability, chemical resistance, processability, surface gloss characteristics, and whitening characteristics to the thermoplastic resin composition.
  • the first copolymer includes an acrylic graft copolymer
  • the acrylic graft copolymer may be formed by graft copolymerization of an acrylic rubber polymer with a vinyl-based monomer and is preferably formed by graft copolymerization of an acrylic rubber polymer with an aromatic vinyl-based monomer and a vinyl cyan-based monomer.
  • the acrylic rubber polymer may have an average particle diameter of 30 to 650 nm or 50 to 550 nm, with the range of 50 to 550 nm being preferred. When the above-described range is satisfied, the weather resistance, impact resistance, elongation, colorability, chemical resistance, processability, surface gloss characteristics, and whitening characteristics of the thermoplastic resin composition can be improved.
  • the first copolymer may include a first acrylic graft copolymer and a second acrylic graft copolymer which are formed of acrylic rubber polymers having mutually different average particle diameters to improve weather resistance, impact resistance, elongation, colorability, chemical resistance, processability, surface gloss characteristics, and whitening characteristics.
  • the first acrylic graft copolymer may be formed by graft copolymerization of an acrylic rubber polymer having an average particle diameter of 300 to 650 nm or 350 to 550 nm with a vinyl-based monomer and is preferably formed by graft copolymerization of an acrylic rubber polymer having an average particle diameter of 350 to 550 nm with a vinyl-based monomer.
  • impact resistance can be improved.
  • the second acrylic graft copolymer may be formed by graft copolymerization of an acrylic rubber polymer having an average particle diameter of 30 to 250 nm or 50 to 150 nm with a vinyl-based monomer and is preferably formed by graft copolymerization of an acrylic rubber polymer having an average particle diameter of 50 to 150 nm with a vinyl-based monomer.
  • weather resistance, colorability, chemical resistance, appearance quality, elongation, and whitening characteristics can be improved.
  • a specific surface area is increased as the acrylic rubber polymer has a smaller average particle diameter, weather resistance may be improved.
  • colorability may be improved.
  • it is possible to uniformly distribute a relatively high content of the second acrylic graft copolymer in the thermoplastic resin composition since it is possible to uniformly distribute a relatively high content of the second acrylic graft copolymer in the thermoplastic resin composition, elongation and whitening characteristics may be improved.
  • the acrylic rubber polymer may be formed by a crosslinking reaction of a (meth)acrylate-based monomer, preferably a C 4 to C 10 alkyl (meth)acrylate-based monomer, and more preferably butyl acrylate.
  • the first acrylic graft copolymer and the second acrylic graft copolymer may be included in a weight ratio of 5:95 to 25:75 or 10:90 to 20:80, with the range of 10:90 to 20:80 being preferred.
  • a thermoplastic resin composition which achieves the balance among impact resistance, weather resistance, colorability, chemical resistance, appearance quality, elongation, and whitening characteristics can be prepared.
  • the first copolymer may be directly prepared, or a commercially available product may be used as the first copolymer.
  • the first copolymer may be included in an amount of 20 to 50 parts by weight, 25 to 45 parts by weight, or 32 to 42 parts by weight with respect to 100 parts by weight of the sum of the first copolymer, the second copolymer, and the third copolymer and is preferably included in an amount of 32 to 42 parts by weight.
  • the second copolymer may impart excellent heat resistance and weather resistance to the thermoplastic resin composition.
  • the second copolymer may work synergistically with a third copolymer to be described below to impart excellent heat resistance, weather resistance, scratch resistance, and colorability to the thermoplastic resin composition.
  • the second copolymer which is a non-grafted copolymer, includes an alkyl-substituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit.
  • the second copolymer may impart excellent heat resistance, weather resistance, and scratch resistance to the thermoplastic resin composition by including the alkyl-substituted styrene-based monomer unit.
  • the second copolymer may impart excellent chemical resistance and stiffness to the thermoplastic resin composition by including the vinyl cyanide-based monomer unit.
  • the second copolymer may impart excellent colorability to the thermoplastic resin composition by including the (meth)acrylate-based monomer unit.
  • the second copolymer may be a copolymer of a monomer mixture including an alkyl-substituted styrene-based monomer, a vinyl cyanide-based monomer, and a (meth)acrylate-based monomer.
  • the monomer mixture may include the alkyl-substituted styrene-based monomer at 30 to 50 wt% or 35 to 45 wt%, with the range of 35 to 45 wt% being preferred.
  • the heat resistance, weather resistance, and scratch resistance of the thermoplastic resin composition can be improved.
  • the monomer mixture may include the vinyl cyanide-based monomer at 20 to 40 wt% or 25 to 35 wt%, with the range of 25 to 35 wt% being preferred.
  • the chemical resistance and stiffness of the thermoplastic resin composition can be improved.
  • the monomer mixture may include the (meth)acrylate-based monomer at 20 to 40 wt% or 25 to 35 wt%, with the range of 25 to 35 wt% being preferred.
  • the colorability of the thermoplastic resin composition can be improved without degrading impact resistance.
  • the (meth)acrylate-based monomer is preferably a C 1 to C 3 alkyl (meth)acrylate-based monomer.
  • the second copolymer may have a weight-average molecular weight of 80,000 to 110,000 g/mol, 85,000 to 105,000 g/mol, or 80,000 to 100,000 g/mol, with the range of 80,000 to 100,000 g/mol being preferred.
  • the fluidity and mechanical properties of the thermoplastic resin composition can be appropriately maintained.
  • the second copolymer may be an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer.
  • the second copolymer may be a commercially available product or prepared by suspension polymerization or bulk polymerization of the monomer mixture and is preferably prepared by bulk polymerization so that a high-purity copolymer is prepared.
  • the second copolymer may be included in an amount of 20 to 45 parts by weight, 25 to 40 parts by weight, or 32 to 38 parts by weight with respect to 100 parts by weight of the sum of the first copolymer, the second copolymer, and the third copolymer and is preferably included in an amount of 30 to 40 parts by weight.
  • the heat resistance, scratch resistance, and colorability of the thermoplastic resin composition can be improved.
  • the heat resistance, scratch resistance, and colorability of the thermoplastic resin composition can be balanced.
  • the third copolymer may impart excellent colorability and processability to the thermoplastic resin composition.
  • the third copolymer may work synergistically with the above-described second copolymer to impart excellent scratch resistance to the thermoplastic resin composition.
  • the third copolymer which is a non-grafted copolymer, includes an alkyl-unsubstituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit.
  • the third copolymer may impart excellent colorability and processability to the thermoplastic resin composition by including the alkyl-unsubstituted styrene-based monomer unit.
  • the third copolymer may impart excellent chemical resistance and stiffness to the thermoplastic resin composition by including the vinyl cyanide-based monomer unit.
  • the third copolymer may impart excellent scratch resistance to the thermoplastic resin composition by working synergistically with the above-described second copolymer.
  • the third copolymer may include the alkyl-unsubstituted styrene-based monomer unit at 10 to 35 wt% or 15 to 30 wt%, with the range of 15 to 30 wt% being preferred.
  • the above-described condition is satisfied, superior processability can be imparted to the thermoplastic resin composition.
  • the third copolymer may include the vinyl cyanide-based monomer unit at 3 to 15 wt% or 5 to 10 wt%, with the range of 5 to 10 wt% being preferred.
  • the above-described condition is satisfied, superior chemical resistance and stiffness can be imparted to the thermoplastic resin composition.
  • the third copolymer may include the (meth)acrylate-based monomer unit at 60 to 80 wt% or 65 to 75 wt%, with the range of 65 to 75 wt% being preferred.
  • the colorability of the thermoplastic resin composition can be improved without degrading impact resistance.
  • the (meth)acrylate-based monomer unit is preferably a unit derived from a C 1 to C 3 alkyl (meth)acrylate-based monomer.
  • the third copolymer may be a methyl methacrylate/styrene/acrylonitrile copolymer.
  • the third copolymer may be directly prepared, or a commercially available product may be used as the third copolymer.
  • the third copolymer may be included in an amount of 10 to 40 parts by weight, 15 to 35 parts by weight, or 20 to 30 parts by weight with respect to 100 parts by weight of the sum of the first copolymer, the second copolymer, and the third copolymer and is preferably included in an amount of 20 to 30 parts by weight.
  • the impact resistance and processability of the thermoplastic resin composition can be improved.
  • the (meth)acrylate-based polymer may impart excellent processability, colorability, scratch resistance, and weather resistance to the thermoplastic resin composition.
  • the (meth)acrylate-based polymer which is a non-grafted copolymer, may include a (meth)acrylate-based monomer unit and preferably includes a C 1 to C 3 alkyl (meth)acrylate-based monomer unit.
  • the (meth)acrylate-based polymer may have a weight-average molecular weight of 15,000 to 150,000 g/mol, 20,000 to 120,000 g/mol, or 24,000 to 98,000 g/mol, with the range of 24,000 to 98,000 g/mol being preferred.
  • the colorability and processability of the thermoplastic resin composition can be improved.
  • the processability of the thermoplastic resin composition can be improved.
  • the (meth)acrylate-based polymer may be poly(methyl methacrylate).
  • the (meth)acrylate-based polymer may be directly prepared, or a commercially available product may be used as the (meth)acrylate-based polymer.
  • the (meth)acrylate-based polymer may be included in an amount of 1 to 20 parts by weight, 3 to 17 parts by weight, or 5 to 15 parts by weight with respect to 100 parts by weight of the sum of the first copolymer, the second copolymer, the third copolymer, and the (meth)acrylate-based polymer and is preferably included in an amount of 5 to 15 parts by weight.
  • the colorability, scratch resistance, and processability of the thermoplastic resin composition can be improved.
  • the additive includes a silicone compound.
  • the silicone compound may impart excellent scratch resistance and abrasion resistance to the thermoplastic resin composition.
  • the silicone compound may enhance releasability so that an injection-molded article formed of the thermoplastic resin composition is easily separated from a metal mold.
  • the silicone compound may enhance injection moldability by acting as a good lubricant in the thermoplastic resin composition.
  • the thermoplastic resin composition has an improved melt flow index when melted, processability may be enhanced.
  • the silicone compound may reduce the surface friction of a molded article formed of the thermoplastic resin composition and improve the surface glossiness thereof.
  • the silicone compound may be uniformly mixed in the thermoplastic resin composition due to having high compatibility with the first copolymer, the second copolymer, the third copolymer, and the (meth)acrylate-based polymer which are the components of the thermoplastic resin composition.
  • the silicone compound is a slip agent and may be polyester-modified siloxane.
  • the silicone compound may be directly prepared, or a commercially available product may be used as the silicone compound.
  • a commercially available product TEGOMER H-Si 6440P or TEGOMER H-Si 6441P manufactured by Evonik Nutrition & Care GmbH may be used.
  • the additive may be included in an amount of 0.1 to 3 parts by weight or 0.5 to 2 parts by weight with respect to 100 parts by weight of the sum of the first copolymer, the second copolymer, and the third copolymer or with respect to 100 parts by weight of the sum of the first copolymer, the second copolymer, the third copolymer, and the (meth)acrylate-based polymer and is preferably included in an amount of 0.5 to 2 parts by weight.
  • the additive can exhibit high compatibility with the components of the thermoplastic resin composition, the scratch resistance, abrasion resistance, moldability, and surface glossiness of the thermoplastic resin composition can be improved, and the surface friction of the thermoplastic resin composition can be reduced.
  • thermoplastic resin molded article is formed of the thermoplastic resin composition according to an embodiment of the present invention and has a heat deflection temperature of 90 °C or more, an L value of 25.5 or less, and a pencil hardness of F or more.
  • the thermoplastic resin molded article preferably has a heat deflection temperature of 90 to 105 °C, an L value of 24 to 25.5, and a pencil hardness of F or more and more preferably has a heat deflection temperature of 91 to 105 °C, an L value of 24 to 25.2, and a pencil hardness of H or more. Since the thermoplastic resin molded article satisfies the above-described conditions, excellent heat resistance, color characteristics, and scratch resistance can be realized.
  • the polymerization product thus produced was transferred to a devolatilization tank, and unreacted monomers and the reaction solvent were recovered and removed at a temperature of 235 °C and a pressure of 20.6 Torr, thereby preparing an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer (weight-average molecular weight: 95,000 g/mol) which is a copolymer in pellet form.
  • A-1) First acrylic graft copolymer: SA927 commercially available from LG Chem Ltd. (graft copolymer formed by graft polymerization of a butyl acrylate rubber polymer having an average particle diameter of 450 nm with styrene and acrylonitrile) was used.
  • (A-2) Second acrylic graft copolymer SA100 commercially available from LG Chem Ltd. (graft copolymer formed by graft polymerization of a butyl acrylate rubber polymer having an average particle diameter of 100 nm with styrene and acrylonitrile) was used.
  • (B-2) 200UH commercially available from LG Chem Ltd. ( ⁇ -methyl styrene/acrylonitrile copolymer) was used.
  • (D-1) IH830 commercially available from LG MMA Corp. (poly(methyl methacrylate), weight-average molecular weight: 98,000 g/mol) was used.
  • (D-2) BA611 commercially available from LG MMA Corp. (poly(methyl methacrylate), weight-average molecular weight: 45,000 g/mol) was used.
  • thermoplastic resin compositions were mixed in contents shown in Table 1 to Table 3 and stirred to prepare thermoplastic resin compositions.
  • thermoplastic resin compositions of Examples and Comparative Examples were introduced into an extruder kneader (cylinder temperature: 240 °C) and then extruded to prepare pellets. Physical properties of the pellets were evaluated by methods described below, and results thereof are shown in Table 1 to Table 3.
  • IZOD impact strength (kg ⁇ cm/cm, Notched, 1/4 In): measured at 23 °C using an impact tester manufactured by TOYO SEIKI SEISAKY-SHO Ltd. in accordance with ASTM D256.
  • Colorability determined by measuring the L value in a SCI mode using Color-Eye 7000A commercially available from GretagMacbeth.
  • Example 6 (A) Acrylic graft copolymer (parts by weight) (A-1) 5 5 5 5 (A-2) 30 30 30 30 30 (B) Alkyl-substituted styrene-based copolymer (parts by weight) (B-1) - 35 35 35 (B-2) 35 - - - (C) Alkyl-unsubstituted styrene-based copolymer (parts by weight) 20 20 20 20 20 20 (D) (Meth)acrylate-based polymer (parts by weight) (D-1) 10 10 - - (D)
  • B Alkyl-substituted styrene-based copolymer (B-1): Copolymer prepared in Preparation Example 1 ( ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer) (B-2): 200UH commercially available from LG Chem Ltd.
  • B Alkyl-substituted styrene-based copolymer (B-1): Copolymer prepared in Preparation Example 1 ( ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer) (B-2): 200UH commercially available from LG Chem Ltd.
  • thermoplastic resin composition of Example 1 which included an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer, was excellent in colorability and scratch resistance compared to the thermoplastic resin composition of Comparative Example 1 which included a styrene/acrylonitrile/methacrylate copolymer.
  • thermoplastic resin composition of Example 2 which included an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer and a silicone compound, was excellent in colorability and scratch resistance compared to the thermoplastic resin composition of Comparative Example 2 which included a styrene/acrylonitrile/methacrylate copolymer and a silicone compound.
  • thermoplastic resin composition of Example 2 which further included a silicone compound, exhibited excellent scratch resistance compared to the thermoplastic resin composition of Example 1.
  • thermoplastic resin composition of Example 3 which included an excessive amount of an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer, was excellent in heat resistance but exhibited slightly degraded colorability compared to the thermoplastic resin composition of Example 2.
  • thermoplastic resin compositions of Examples 4 to 6 which included an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer, were excellent in colorability and scratch resistance compared to the thermoplastic resin composition of Comparative Example 3 which included a styrene/acrylonitrile/methacrylate copolymer.
  • thermoplastic resin composition of Comparative Example 4 which did not include an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer
  • a heat deflection temperature and impact strength were significantly degraded.
  • thermoplastic resin composition of Comparative Example 5 which did not include an ⁇ -methyl styrene/acrylonitrile/methyl methacrylate copolymer and a styrene/acrylonitrile copolymer
  • a melt flow index, a heat deflection temperature, and impact strength were significantly degraded.
  • thermoplastic resin composition of Comparative Example 6 which did not include a styrene/acrylonitrile copolymer, colorability was significantly degraded.

Claims (10)

  1. Composition de résine thermoplastique comprenant :
    un premier copolymère incluant une copolymère acrylique greffé ;
    un deuxième copolymère incluant une unité de monomère à base de styrène substitué par un alkyle, une unité de monomère à base de cyanure de vinyle et une unité de monomère à base de (méth)acrylate ; [[et]]
    un troisième copolymère incluant une unité de monomère à base de styrène non substitué par un alkyle, une unité de monomère à base de cyanure de vinyle et une unité de monomère à base de (méth)acrylate ; et
    un additif incluant un composé de silicone.
  2. Composition de résine thermoplastique selon la revendication 1, dans laquelle le premier copolymère inclut :
    un premier copolymère acrylique greffé formé par copolymérisation par greffage d'un polymère caoutchouteux acrylique ayant un diamètre de particule moyen compris entre 300 et 650 nm avec un monomère à base de vinyle ; et
    un deuxième copolymère acrylique greffé formé par copolymérisation par greffage d'un polymère caoutchouteux acrylique ayant un diamètre de particule moyen compris entre 30 et 250 nm avec un monomère à base de vinyle,
    dans laquelle le diamètre de particule moyen est mesuré par une méthode de diffusion dynamique de la lumière laser.
  3. Composition de résine thermoplastique selon la revendication 2, dans laquelle le premier copolymère inclut le premier copolymère acrylique greffé et le deuxième copolymère acrylique greffé dans un rapport en poids compris entre 5:95 et 25:75.
  4. Composition de résine thermoplastique selon la revendication 1, dans laquelle le deuxième copolymère est un copolymère d'un mélange de monomères incluant une unité de monomère à base de styrène substitué par un alkyle compris entre 30 et 50 % en poids, un monomère à base de cyanure de vinyle compris entre 20 et 40 % en poids et un monomère à base de (méth)acrylate compris entre 20 et 40 % en poids.
  5. Composition de résine thermoplastique selon la revendication 1, laquelle composition de résine thermoplastique inclut, pour 100 parties en poids de la somme du premier copolymère, du deuxième copolymère et du troisième copolymère :
    entre 20 et 50 parties en poids du premier copolymère ;
    entre 20 et 45 parties en poids du deuxième copolymère ; et
    entre 10 et 40 parties en poids du troisième copolymère.
  6. Composition de résine thermoplastique selon la revendication 1, comprenant en outre un polymère à base de (méth)acrylate.
  7. Composition de résine thermoplastique selon la revendication 6, dans laquelle le polymère à base de (méth)acrylate est un poly(méthyl méthacrylate).
  8. Composition de résine thermoplastique selon la revendication 6, laquelle composition de résine thermoplastique inclut le polymère à base de (méth)acrylate dans une quantité comprise entre 1 et 20 parties en poids pour 100 parties en poids de la somme du premier copolymère, du deuxième copolymère, du troisième copolymère et du polymère à base de (méth)acrylate.
  9. Composition de résine thermoplastique selon la revendication 1, laquelle composition de résine thermoplastique inclut l'additif dans une quantité comprise entre 0,1 et 0,3 partie en poids pour 100 parties en poids de la somme du premier copolymère, du deuxième copolymère et du troisième copolymère.
  10. Article moulé en résine thermoplastique faite avec la composition de résine thermoplastique selon la revendication 1 et ayant une température de déformation thermique supérieure à 90°C, une valeur L égale ou inférieure à 25,5 et une dureté au crayon égale ou supérieure à F,
    dans laquelle la température de déformation thermique, la valeur L et la dureté au crayon sont mesurées comme indiqué dans les Exemples expérimentaux 1 et 2 dans la spécification.
EP20759477.1A 2019-02-19 2020-02-10 Composition de résine thermoplastique et article moulé en résine thermoplastique Active EP3778767B1 (fr)

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KR102386835B1 (ko) 2022-04-15
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CN112204101B (zh) 2023-06-16
EP3778767A1 (fr) 2021-02-17
JP7374514B2 (ja) 2023-11-07
JP2022503504A (ja) 2022-01-12
US20210221996A1 (en) 2021-07-22
US11655361B2 (en) 2023-05-23
KR20200101285A (ko) 2020-08-27

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